a(n) = number of subsets of {1,2,...,n} that contain more primes than nonprimes.

Terms

a(0) =0a(1) =0a(2) =1a(3) =4a(4) =5a(5) =16a(6) =22a(7) =64a(8) =93a(9) =130a(10) =176a(11) =562a(12) =794a(13) =2380a(14) =3473a(15) =4944a(16) =6885a(17) =21778a(18) =31180a(19) =94184a(20) =137980a(21) =198440a(22) =280600a(23) =880970a(24) =1271626a(25) =1807781a(26) =2533987a(27) =3505699a(28) =4791323a(29) =16489546